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@ -3703,12 +3703,15 @@ void MarkTileLineDirty(const TileIndex from_tile, const TileIndex to_tile, Viewp
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const Point from_pt = RemapCoords2(TileX(from_tile) * TILE_SIZE + TILE_SIZE / 2, TileY(from_tile) * TILE_SIZE + TILE_SIZE / 2);
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const Point to_pt = RemapCoords2(TileX(to_tile) * TILE_SIZE + TILE_SIZE / 2, TileY(to_tile) * TILE_SIZE + TILE_SIZE / 2);
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const int block_radius = 20;
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for (Viewport * const vp : _viewport_window_cache) {
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if (flags & VMDF_NOT_MAP_MODE && vp->zoom >= ZOOM_LVL_DRAW_MAP) continue;
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int x1 = from_pt.x / block_radius;
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int y1 = from_pt.y / block_radius;
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const int x2 = to_pt.x / block_radius;
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const int y2 = to_pt.y / block_radius;
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const int block_shift = 2 + vp->zoom;
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int x1 = from_pt.x >> block_shift;
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int y1 = from_pt.y >> block_shift;
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const int x2 = to_pt.x >> block_shift;
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const int y2 = to_pt.y >> block_shift;
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/* http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm#Simplification */
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const int dx = abs(x2 - x1);
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@ -3717,11 +3720,12 @@ void MarkTileLineDirty(const TileIndex from_tile, const TileIndex to_tile, Viewp
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const int sy = (y1 < y2) ? 1 : -1;
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int err = dx - dy;
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for (;;) {
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MarkAllViewportsDirty(
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(x1 - 1) * block_radius,
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(y1 - 1) * block_radius,
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(x1 + 1) * block_radius,
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(y1 + 1) * block_radius,
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MarkViewportDirty(
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vp,
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(x1 - 1) << block_shift,
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(y1 - 1) << block_shift,
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(x1 + 2) << block_shift,
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(y1 + 2) << block_shift,
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flags
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);
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if (x1 == x2 && y1 == y2) break;
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@ -3736,6 +3740,7 @@ void MarkTileLineDirty(const TileIndex from_tile, const TileIndex to_tile, Viewp
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}
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}
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}
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}
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static void MarkRoutePathsDirty(const std::vector<DrawnPathRouteTileLine> &lines)
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{
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